even during his lifetime, no muslim called the Prophet (saw) by saying "ya muhammad", they used to call him as rasul-Allah.... only his enemies wud call him by saying "ya muhammad" because they did not want to give him respect.... those among the disbelievers who did not believe him to be a prophet, but nonetheless respected him used to call him by his kunyat "abu qasim"....
DEAR FRIEND I KNOW THAT YOU ALWAYS TURN UR BACK WHEN I SHOW REF: AND AVIDENCE, How ever there is answer of you QUESTION IF you do not close ur eyes and ear and lock ur HEART.
The Hadith of the Blind Man
Tirmidhi relates, through his chain of narrators from 'Uthman ibn Hunayf,
that a blind man came to the Prophet (Allah bless him and grant him peace)
and said, "I've been afflicted in my eyesight, so please pray to Allah for
me." The Prophet (Allah bless him and grant him peace) said: "Go make
ablution (wudu), perform two rak'as of prayer, and then say:
" 'O Allah, I ask You and turn to You through my Prophet Muhammad, the
Prophet of Mercy; O Muhammad [Ya Muhammad], I seek your intercession with
my Lord for the return of my eyesight [and in another version: "for my need
, that it may be fulfilled. O Allah, grant him intercession for me"].'"
The Prophet (Allah bless him and grant him peace) added, "And if there is
some need, do the same."
MAY ALLAH GUIDE YOU